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ChemInform Abstract: Photohalogenation of 3-Acetylcoumarins: Facile Synthesis of 3-(2-Amino-4-thiazolyl)coumarins and Their Conversion into 3-[2-(2,5-Dimethylpyrrol-1-yl)thiazol-4-yl]coumarins.

✍ Scribed by V. A. VARDHAN; V. R. RAO

Publisher: John Wiley and Sons
Year: 2010
Weight: 32 KB
Volume: 29
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199827156

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✦ Synopsis

Photohalogenation of 3-Acetylcoumarins: Facile Synthesis of 3-(2-Amino-4-thiazolyl)coumarins and Their Conversion into 3-[2-(2,5-Dimethylpyrrol-1-yl)thiazol-4-yl]coumarins.

-A facile synthesis of 3-(2-amino-4-thiazolyl)coumarins (III) by reacting acetylcoumarins (I) with thiourea under photohalogenation conditions in the presence of lanthanum(III) or samarium(III) catalysts is described. These compounds are converted into pyrrole derivatives (V) by reaction with acetonylacetone. -(VARDHAN, V.

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